Briefcase



FIG. 1 is a front perspective view of a briefcase showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof with the handles in a different configuration; and,

FIG. 9 is an enlarged partial view of a portion of the briefcase shown in FIG. 3.

The dot-dash broken lines in FIG. 9 that surround and illustrate the boundaries of the enlarged detail view form no part of the claimed design. The broken lines shown on the surface of the briefcase represent stitching and are part of the claimed design. 

CLAIM The ornamental design for a briefcase, as shown and described. 